Dynasonics 901 User Manual
Series 901
Enhanced Ultrasonic Flow Meter
Operations & Maintenance
Manual
REV 4/02
Location
QUICK-START OPERATING INSTRUCTIONS
This manual contains detailed operating instructions for
all aspects of the D901/M instrument. The following
condensed instructions are provided to assist the
operator in getting the instrument started up and running
as quickly as possible. This pertains to basic operation
only. If specific instrument features are to be used or if
the installer is unfamiliar with this type of instrument,
refer to the appropriate section in the manual for
complete details.
1. TRANSDUCER LOCATION
A. Determine the appropriate mounting location for
the transducers by referring to Figure 1.
Receiving
Transducer
Transmitting
Transducer
Solids Bearing or Aerated Liquids Clean Liquids
Pipe Preparation
and Mounting
90° Elbow
Fluid Velocity ∝ Γ1Γ2
Figure 1 Transducer Locations
2. PIPE PREPARATION AND TRANSDUCER
MOUNTING
A. The piping surface, where the transducers are to
be mounted, needs to be clean and dry. Remove
loose scale, rust and paint to ensure satisfactory
acoustical bonds.
B. Connect the mounting straps around the pipe.
Leave the strap loose enough to slip the
transducers underneath.
C. Apply a liberal amount of silicone rubber
(enclosed) onto the transducer faces and the
prepared areas of the pipe.
Rev. 04/02 -1- D901/M
QUICK-START OPERATING INSTRUCTIONS
D. Place each transducer under the mounting strap,
180° apart on the pipe. Ensure that the transducer
cables are facing the same direction. See Figure 2.
Connections
Receiving
Transducer
Transmitting
Transducer
Figure 2 Transducer
E. Route the transducer cable back to the transmitter,
avoiding locations near high voltage supply wires.
3. TRANSDUCER CONNECTION
A. Do not
transducers.
B. Connect the spade terminals to the appropriate
terminal block within the transmitter.
4. INITIAL SETTINGS AND POWER UP
attempt to add additional cable to the
A. Set the SENSITIVITY control to - 2.
B. Apply AC power. The POWER indicator will
Startup
illuminate.
C. If the pipe is full of a flowing liquid, the SIGNAL
STRENGTH meter will indicate and the READ
indicator will illuminate.
D. Adjust the SENSITIVITY control so that the right-most
green LED just comes ON.
E. The default display indicates fluid velocity as either
FPS or MPS. Refer to the appropriate place in this
manual for specific features and options.
Rev. 04/02 -2- D901/M
TABLE OF CONTENTS
Part 1 - Introduction
Part 2 - Installation
Quick-Start Operating Instructions
Introduction
General
Applications
Model Matrix
Product Specifications
Bench Test Procedure
Installation
Transducer Mounting Locations
Pages
1-2
5
5
6
7-8
9
10-12
Pipe Preparation
Transducer Mounting
Transmitter Mounting
Electrical Connections
Part 3 - Startup and
Configuration
Rev. 04/02 -3- D901/M
Instrument Startup and Configuration
Initial Settings
Modes of Operation
Pipe I.D. Input
Full Scale Input
Totalizer Exponent Input
Engineering Units Input
13
13-15
16-17
17-19
20
21
22
23
24
25
TABLE OF CONTENTS
Part 4 - Troubleshooting
Instrument Startup and Configuration
CAL. Constant Input
Display Damping
System Damping
TEST Diagnostic Key
System and Totalizer RESET
Totalizer Reset
Trouble Shooting Guide
Appendices
Face Plate Drawing
Intrinsically Safe Installation
Pages
26
27
27
27
28
28
29-30
31+
High-Temperature Transducers
Clean Liquid Installation Guide
Multiple Unit Cross-talk
Pipe Dimension Chart: Cast Iron
Pipe Dimension Chart: ST, SS, PVC
Velocity to Volumetric Conversion
Statement of Warranty
Customer Service
Rev. 04/02 -4- D901/M
PART 1 - INTRODUCTION
General
Application Versatility
The D901/M ultrasonic flow meter is designed to measure
the fluid velocity of liquid within closed conduit. The
transducers are a non-contacting, clamp-on type, which
will provide benefits of non-fouling operation and ease of
installation.
The flow meter operates by transmitting an ultrasonic
sound from its transmitting transducer through the pipe
wall into the flowing liquid. The sound will be reflected by
suspended particles or bubbles within the liquid and
recorded by the receiving transducer. A frequency shift
(Doppler effect) will occur that is directly related to the
speed of the moving particle or bubble. This shift in
frequency is interpreted by the instrument and converted
to various user defined measuring units.
A unique feature of this product is that it employs a
proprietary digital filtering system and recognition circuit.
This feature allows the instrument to measure fluid
velocities of clean liquids if the transducers are mounted
downstream from a 90° elbow. The non-symmetrical
hydraulic turbulence which occurs downstream of an
elbow is captured, linearized and can be displayed as
liquid velocity and volume. This capability is not available
in conventional Doppler technology.
The D901/M flow meter can be successfully applied on a
wide range of metering applications. The simple to
program transmitter allows the standard product to be
used on pipe sizes ranging from 1 - 120 inch [ 25 - 3050
mm ] pipe I.D. (With the small pipe transducer option, the
pipe size range is 0.25 - 1 inch [ 6 - 25 mm]). A variety of
liquid applications can be accommodated: raw sewage,
reclaimed water, river water, plant effluent, mining slurries,
sludge, etc. Because the transducers are non-contacting
and have no moving parts, the flow meter is not affected
by system pressure, fouling or wear. Standard
transducers are rated to 250°F [121°C]. Optional high
temperature transducers are rated to operate to 400°F
[204°C].
Rev. 04/02 -5- D901/M
PART 1 - INTRODUCTION
User Safety
Battery Backup
Product Identification
The D901/M employs modular construction and provides
electrical safety for the operator. The display face
contains voltages no greater than 9 Vdc and the metal
work is electrically connected to Earth Ground. The
display face swings open to allow access to user
connections.
A rechargeable nickel-cadmium battery on the back of
the display board retains all user-entered configuration
values in memory for several years (at 25°C), even if
power is lost or turned off. The ten year battery is
continually trickle charged whenever line power is
applied. A completely discharged battery recharges fully
after 48 hours of instrument operation.
The serial number and complete model number of your
D901/M is located on the inside of the transmitter’s front
cover. Should technical assistance be required, please
provide the Dynasoncs’ Customer Service Department
with this information.
Product Matrix
Rev. 04/02 -6- D901/M
PART 1 - SPECIFICATIONS
Ambient Conditions
Display
Transducer to Transmitter Distance
Power Requirements
Pipe Sizes
Transmitter - -22 to 160°F [ - 30 to 70 °C],
0-95% relative humidity, non-condensing.
Transducers - - 40° to 250°F [ -40° to 121°
C] Standard. Optional: - 40° to 400°F [ - 40°
to 204°C]
2 line x 20 character alphanumeric LCD,
back lit. Digit height 0.2 inches [ 5 mm]
Standard: 20 feet [ 6.09 meters ], flexible
armored conduit. Optional lengths to 300
feet [ 100 meters ]
115/230 VAC 50/60 Hz ± 10%. Optional:
100/200 VAC 50/60 Hz ± 10% and 12VDC.
Power consumption less than 12 VA.
1 - 120 inches [ 25 - 3050 mm ] Pipe I.D.
Optional: 0.25 - 1 inch [6 – 25 mm ], Small
Pipe Transducer
Velocity
Measuring Units
Indicators
Liquid Requirements
Rev. 04/02 -7- D901/M
0.5 - 20 FPS [ 0.15 - 6.08 MPS]
FPS, GPM, MGD [ MPS, LPM, M3/Hr ]
Power, Signal Strength, Fault, Over-range,
Read, Flow Analyzer
25 ppm of 30 micron* suspended solids or
bubbles.
* Less than this minimum will require
transducer mount downstream of a 90°
PART 1 - SPECIFICATIONS
Outputs
Non-linearity
Sensitivity
Repeatability
Response Time
Enclosure
Size
4-20 mA, 600 Ohms max., Isolated.
12 Vdc pulse, 50 mS duration, 0-0.15 Hz to
0-2.5 Hz, user adjustable.
±2 % Full Scale
0.4 % of Full Scale
±0.4% of Full Scale
5-50 seconds, user configured adjustable, to
90% of value, step change in flow.
NEMA 4X, [IP-65] Fiberglass w/SS
hardware.
13.5H x 11.3W x 5.60D inches
[343H x 287W x 141D mm]
Mounting
Weather Shield
Net Weight
Wall mount
Optional weather visor; Dynasonics P.N.
D003-899-001
15 lbs. [ 6.8 Kg ]
Rev. 04/02 -8- D901/M
PART 2 - PRE-INSTALLATION CHECKOUT
Unpacking
Functional Test
After unpacking, it is recommended to save the shipping
carton and packing materials in case the instrument is
stored or re-shipped. Inspect the equipment and carton
for damage. If there is evidence of shipping damage,
notify the carrier immediately.
The D901/M flow meter can be checked for basic
functionality using the following Bench Test procedure.
It is recommended that this operation be performed
before installing the transducers or transmitter
permanently.
Procedure:
1. Open the D901/M transmitter enclosure and the inner
display door.
2. Connect the transducer cable terminals to the
corresponding terminal block locations within the
transmitter. See Figure 3.
3. Set the transmitter SENSITIVITY control [located on
the display door] to -2.
4. Apply power.
5. Hold the transducers, the flat sides facing each other,
approximately 6-8 inches [150-200 mm] apart.
6. Move the transducers towards and away from each
other 1 inch [25mm] for several cycles at
approximately 1 second interval.
7. If unit is functioning properly, the READ LED will
illuminate and the rate display will indicate flow
readings.
Figure 3
Bench Test is Complete
Rev. 04/02 -9- D901/M
PART 2 - TRANSDUCER INSTALLATION
Transducer Mounting
Considerations
Step A - Mounting
Locations
CASE 1:
The transducers that are utilized by the D901/M contain
piezo electric crystals for transmitting and receiving
ultrasonic sound energy through the pipe wall.
The transducers can be mounted in three different
configurations. The selection of the proper configuration
is dependent on the liquid to be measured characteristics.
The three liquid characteristics, which will affect mounting
location and orientation, are as follows:
CASE 1: Liquid that contains 25 to 10,000 PPM [1%] of 30
micron or larger suspended solids or aeration.
CASE 2: Liquid that contains greater than 10,000 PPM
[1%] of 30 micron or larger suspended solids or aeration.
CASE 3: Liquid that contains fewer than 25 PPM of 30
micron or larger suspended solids or aeration and
suspended solids and aeration content which is smaller
than 30 microns.
Liquid that contains 25 to 10,000 PPM [1%] of 30
micron or larger suspended solids or aeration.
Select a transducer mounting location with adequate
straight runs of pipe, both upstream and downstream, to
achieve stable readings. Examples of minimum upstream
and downstream requirements are included in Table 1.
Mount the transducers 180° apart and facing each other
on the pipe. If the pipe is horizontal, the preferred
mounting orientation is 3 and 9 o’clock, with 12 o’clock
being the top of the pipe. Orientation on vertical pipes
does not matter. See Figure 4.
Rev. 04/02 -10- D901/M
PART 2 - TRANSDUCER INSTALLATION
1
2
3
4
5
Table 1
1
Example Upstream Pipe
Diameters
* **
1 24 4
2 14 3
3 9 3
4 8 3
5 8 3
6 24 4
Downstream
Pipe Diameters
6
1
The D901/M system will provide repeatable measurements on piping systems that do not
meet these requirements, but the accuracy
Liquid that contains greater than 10,000 PPM [1%] of
CASE 2:
30 micron or greater suspended solids or aeration.
may be influenced to various degrees.
Top View of Pipe
Figure 4
Rev. 04/02 -11- D901/M
PART 2 - TRANSDUCER INSTALLATION
The mounting location and straight pipe requirements for
CASE 2 liquid characteristics are the same as those
describe in CASE 1. The difference will be in the location
of the transducers on the pipe. As the discontinuities
(suspended solids or aeration) reach a level of
approximately 1% or 10,000 PPM, sound can no longer be
reliably transmitted through the liquid as it has a tendency
to scatter and absorb into the high concentration of
CASE 3:
Figure 5
discontinuity. To compensate for this, the D901/M
transducers can be located on the same region of the
pipe. In a horizontal pipe, mount the transducers at 2
o’clock and 4 o’clock positions. (Assuming 12 o’clock as
the top of the pipe.) See Figure 5.
Liquid that contains fewer than 25 PPM of 30 micron
or larger suspended solids or aeration. Or, liquid that
contains solids or aeration which is smaller than 30
microns.
The transducers will be mounted 1 to 3 pipe diameters
downstream from a 90° elbow. The orientation of the
transducers on the pipe will be 180° apart and facing each
other and 90° out of the plane of the elbow. See Figure 6.
Rev. 04/02 -12- D901/M
PART 2 - TRANSDUCER INSTALLATION
STEP B -
PIPE SURFACE
PREPARATION
STEP C -
TRANSDUCER
MOUNTING
Figure 6
Before the transducer heads are bonded to the pipe
surface, an area slightly larger than the flat surface of the
transducer must be cleaned to bare metal on the pipe.
(Plastic pipes do not require preparation beyond removal
of paint.) Remove all scale, rust and paint. Thoroughly
dry and degrease the mounting surfaces.
NOTE: Small pits in the piping surface typically do not
significantly impact ultrasonic transmission or signal
reception.
After selecting the applicable mounting location and
preparing the piping surface as detailed in A and B, the
transducer can be mounted to the pipe.
To assure an acoustically conductive path between the
transducer face and the prepared piping surface, a
coupling compound is employed. Enclosed with the D901/
M system is tube of Dow Corning RTV-732. This couplant
is satisfactory for permanently mounting the transducers
to the pipe. If the installation is temporary (less than a few
days), Dynasonics recommends utilizing a silicone-based
grease such as Dow Corning 111. The grease chosen
must be rated to not flow at the temperature of the pipe.
Rev. 04/02 -13- D901/M
Loading...